PHYS 101-101
What is 281x10^2 in scientific notation?
2.81x10^4
A speed of 90 km/h is equal to _____m/s.
25
Which of the following has the greatest number of significant figures?
3.14000
If there are 8 furlongs in one mile, how many furlongs does a horse run in a 4-mile course?
32
What is the result of dividing 6x10^8 by 2x10^4?
3x10^4
By what factor does the centripetal acceleration change is a car goes around a corner twice as fast?
4
If you did the appropriate unit conversions, which of the following could be added to the quantity of 4 grams?
4 kilograms
What is 4.37x10^6 in decimal notation?
4,370,000
A mass of 4.3x10^3 grams can also be written as:
4.3 kilograms
The measurement 0.0000043 m, expressed correctly using scientific notation, is:
4.3x10^-6
Which of the following could be a velocity?
5 meters/second west
In order to apply the conservation of energy, the system must be
Closed
An object moving in a circle at a constant speed has an acceleration that is
Directed toward the center of the circle
The velocity vector of an object moving in a circle can change
Direction without changing size
Applying a great force for a long time produces a _____ in momentum
Great increase
Gravitational Potential Energy depends only on the
Height of an object
The line that starts at the pivot point and extends through the point of application of the force is known as the
Radial line
Solve R=CS/d for C
Rd/S=C
If the distance between two objects doubles. the gravitational force is
Reduced to one quarter of its original magnitude
Newton's second law of motion deals with _____.
Relationships between force, mass, and acceleration.
What rule allows us to determine the position of the angular velocity vector?
Right hand rule
An objects resistance to change in its rotational velocity is called its
Rotational inertia
Rotational acceleration must always point in the _____ direction as the net torque
Same direction
Displacement is a _____ quantity
Scalar
Kinetic energy is a
Scalar quantity
The two variables that determine the range of a projectile are
Speed and angle
An object will be _____ when it's angular acceleration is in the same direction as the angular velocity
Speeding up
In a circular motion, in the absence of forces, a ball would exhibit
Straight line motion
The magnitude of a gravitational force is dependent upon _____
The mass of two or more objects and the distance between those objects
If you are traveling in a straight line at a constant speed, your acceleration would be zero.
True
Linear momentum is a vector quantity
True
The Law of Conservation of Angular Momentum says that the angular momentum of a rotation object subject to no net external torque is a constant
True
The acceleration is always the slope of the "velocity versus time" graph and the velocity is always the slope of the "position versus time" graph
True
The average speed disregards the detail of the trip.
True
The pivot point is the axis about which the object can rotate
True
The weight vector is always drawn straight down
True
The field concepts divides the task of determining the force on a mass into _____
Two distinct parts
Newton's first law for rotational motion states that an object will maintain its state of rotational motion unless acted on by an unbalanced (or net)
Torque
The rotational equivalent of force is known as
Torque
Your instructor rides on a merry-go-round turning at a constant rate. In which direction does the net force on your instructor point?
Toward the center
An impulse can be either positive or negative
True
Gravitation is considered to be a universal force
True
If the next external torque on a system is zero, the total angular momentum of the system does not change
True
Solve y-y1+m(x-x1) for x
(y-y1)/m+x1=x
What is 4.1x10^-5 in decimal notation
0.000041
What is the result of the following calculations, reported to the correct number of significant figures? 0.12 g + 0.003 g
0.12 g
The thickness of the leg of an ant is 0.035 centimeters. How many millimeters is this?
0.35 mm
Express 15,000,000,000 in scientific notation.
1.5x10^10
Calculate and give the answer in scientific notation: 4.4x10^7/2.225x10^5
1.97x10^2
On Earth, a ball is thrown vertically upward and you know that its speed is 20 m/s as it leaves the thrower's hand. What is the speed of the ball 1 second later?
10 m/s
A football quarterback throws a long pass toward the end zone. Assume that you can neglect the effects of air resistance. At the instant the ball reaches its highest point, what is the acceleration of the ball?
10 m/s^2; downward
What is 1.59x10^7 g in decimal notation?
15,900,000 g
Convert a speed of 35.8 mi/hr to its equivalent in m/s.
16.0 m/s
Determine the number of significant figures in 123,453.
6
Determine the number of significant figures in 650,502?
6
If a league is equal to 3 miles, how many miles are there in "20,000 Leagues Under the Sea?"
60,000
Which of the following is equal to 86,400 seconds?
8.64x10^4 seconds
What is the product of 4x10^4 and 2x10^8?
8x10^12
Variations in gravitational force are due to changes in the
Acceleration due to gravity
Only the force that acts _____ can do work
Along the direction of motion
Consider a solid object which is subjected to a net torque. That object will experience which of the following?
An angular acceleration
A force acting for a time interval is known as
An impulse
Acceleration can only happen when there is a ____
An unbalanced force
Multiply the equation for linear momentum by radial distance r and you have
Angular momentum
A satellite in a geosynchronous orbit would
Appear to remain fixed directly above one spot on Earth
A ball is thrown straight up. It reaches its highest point and then falls back. Which of the following is the correct statement?
At the highest point in its motion, the ball's velocity is zero.
Neglecting friction, if a Cadillac and a Volkswagen start rolling down a hill together, the heavier Cadillac will get to the bottom ______
At the same time as the Volkswagen.
Which of these has it's center of mass where no mass exists?
Basketball
A center fleeing force is known as a
Centrifugal force
Newton's second law can be rearranged to show that the _____ is equal to the _____
Change in momentum; Impulse
If the net force on an object is directed due west, which way does the acceleration point?
Due west
A low tide would occur when the moon is in the
Either first or third quarter
A pair of forced will always produce both translational and rotational acceleration.
False
Henry Cavendish developed a method for the calculation of g
False
Impulse has the same direction as velocity
False
In regards to projectile motion the horizontal speed is the only speed that varies.
False
Mechanical energy will only be conserved if frictional forces are present
False
Newton was able to calculate gravitational force once he devised a method to calculate "G."
False
One form of energy can never be transferred into another form
False
Rotational kinetic energy depends on rotational inertia and rotational speed
False
Static friction has a constant value.
False
The center of mass can only be determined for symmetrical objects
False
The harder you push on a wall, the more work you do
False
When you throw a ball upward, the velocity at the highest point in its path will be the greatest.
False
Where ever there is more than one applied force, the net force and net torque will be zero
False
Your mass will change depending on where you are located.
False
A ball thrown at an angle of 75 degrees and one thrown at an angle of 20 degrees will land in the same place.
False.
A common type of door stop is a wedge made of rubber. Is such a stop more effective when jammed under the door
Far from the hinges
An object that rotates counterclockwise is said to have a
Positive torque
The property of an object at rest to remain at rest is known as:
Inertia.
A gun is held horizontally and fired. At the same time the bullet leaves the barrel, an identical bullet is dropped from the same height. Neglect air resistance. Which bullet will hit the ground first?
It will be a tie
The base SI unit of mass is:
Kilogram
A child stands on a bathroom scale while riding in an elevator. The child's weight when the elevator is not moving is 500 N. What does the scale read as the elevator comes to a stop at the tenth floor on its upward trip?
Less than 500 N
Linear momentum is defined to be
Mass times velocity
The rotational equivalent of mass is
Moment of inertia
Two cars suffer a head-on collision. What is conserved in the collision?
Momentum
We can explain the recoil that occurs when a rifle is fired by using the conservation of
Momentum
Translational motion is
Motion along a path
The lowest tides are known as
Neap tides
Which law is an example of the Inverse Square Law?
Newton's Third Law
When is the angular momentum of a system constant?
Only when no net external force acts on the system
To increase the moment of inertia of a body of a fixed mass about an axis, you must
Place part of the body farther from the axis
If the net force is in the same direction as the velocity, the work is
Positive
Which of the following could be considered an "accelerator" in an automobile?
The brake pedal, the steering wheel, and the gas pedal
A car will roll over if
The center of gravity is outside the base of support
A tail gunner jumped from a Lancaster bomber, but did not break any bones or die because he fell into the branches of a tree and then into a snow bank. Physics explains this because
The decreased stopping time in the tree meant a smaller stopping force
A parachutist reaches terminal speed when _____
The force of air resistance equals her weight
A bowler lifts a bowling ball from the floor and places it on a rack. If you know the weight of the ball, what else must you know in order to calculate the work she does on the ball?
The height of the rack
The higher a satellite is in its orbit,
The longer it takes to complete one orbit
Which has greater momentum: A heavy truck at rest or a moving roller skate?
The roller skate
The gravitational attraction of the Sun for Earth is ______ that of Earth for the Sun.
The same as
A sheet of paper and a book fell at different rates in the classroom until the paper was wadded up into a ball. We then claimed that if the air resistance could be neglected, all objects would fall at _____
The same constant acceleration
Two ice skaters push off of one another. The first skater has a weight of 300 N. The second skater has a weight of 500 N, What is true of the skaters' acceleration?
The skater weighing 300 N will accelerate away at a higher rate
In Aesop's fable of the tortoise and the hare, the "faster" hare loses the race to the slow and steady tortoise. During the race, which animal has the greater average speed?
The tortoise.
Assume that a red car has a mass of 1000 kg and a white car has a mass of 2000 kg. If both cars are traveling with the same velocity
The white car's kinetic energy is twice as big
If you push on a railroad boxcar with a force of 300 N and it doesn't move, you can conclude that _____
There is a total force of 300 N in the opposite direction
_____ is the internal energy of an object due to the kinetic energy of its atoms and/or molecules associated with temperature.
Thermal energy
Finding the center of mass of an irregularly shaped object requires the object to be suspended from
Two points
Angular momentum is considered to be a
Vector quantity
Which f the following is NOT a unit of energy?
Watt
An object is accelerating _____
When its speed or direction changes.
Under what conditions it the kinetic energy conserved in a collision?
When the collision is perfectly elastic
Solve the following equation for c: v/a=b/c
c=ab/v